Annealing cover



J. 18, 1938. E. N. MILLAN 2,105,750

ANNEALING COVER Filed Oct. 9, 1935 2 Sheets-Sheet 1 INVENTOR EDWARDNMLLAM ATTORNEYS.

18, 19380 E. N. MILLAN 2,105,750

ANNEALING COVER Filed Oct. 9, 1935 2 Sheets-Sheet 2 INVENTOR law/220' NM; 4 .4.

I ATTORNEY-S.

Patented Jan. 18, 1938 ANNEALING COVER Edward N. Millan, Middletown, Ohio, assignor to The American Rolling Mill Company, Middletown,

Ohio, a: corporation of Ohio Application October 9, 1935, Serial No. 44,190

14 Claims.

My invention relates to annealing covers for covering packs of sheet metal or coils while they are being heat treated. It is unnecessary to describe the use of annealing covers, as they are well known in the art. However in the use of annealing covers they are subjected to certain strains, for in many cases the gases surrounding the pack being treated are under pressure. For this reason the annealing covers must be of rugged construction, and yet should be as light as is consonant with adequate rigidity. In accordance with the above requirements I have made such annealing covers of corrugated roll plate or sheet metal, and these covers are disclosed and claimed in my copending applications Serial No. 3,083, filed January 23, 1935, and Serial No. 37,858, filed August 26, 1935.

In many of the present types of box annealing covers of the all cast steel type, failures have resulted due to the high thrust loads from the heavy cast steel arch top. This load often causes the sides to bulge until a total failure of the structure results. My invention relates to a construction whereby the roof arch is made of relatively light weight roll plate which may be corrugated for additional stiffness; this results in reduced side thrust loads.

My invention also contemplates a construction comprising cast steel side walls and light plate end walls and a roof arch of light plate, which may be either fiat or corrugated.

By my novel construction I not only achieve the advantages due to a reduction of side thrust loads as above described, but I retaingenerally the advantages of the cast steel cover in resisting deformation due to heat. Since the side walls of annealing covers in annealing furnaces are subject to much lighter heat than the rest of the cover, I retain the strength of the cast steel in that part of the cover where it is of greatest importance.

It is an object of my invention therefore, to provide a rugged and sturdy box annealing cover for use in box annealing furnaces, which will not be subject to large side thrust loads from the roof arch.

It is another object of my invention to provide an annealing cover of the above mentioned type which will be relatively simple of construction, and not more expensive than other annealing covers which do not have the above advantages.

It is a further object of my invention to provide a top or roof arch for an annealing cover which shall be relatively light in weight, and which shall at the same time be of sufficient rigidity to withstand the strains to which it will be subjected. I

A further object of my invention is to provide additional means for strengthening an annealing'cover whereby bulging of the sides is pre 5 vented.

Generally it is the object of my invention to provide an annealing cover which will retain its original shape and form throughout its life in spite of the stresses to which it is continually 10 being subjected.

These and other objects of my invention which will be set forth hereinafter, or will be apparent to one skilled in the art upon reading these specifications, I accomplish by that certain construction and arrangement of parts of which I shall not describe a preferred embodiment. Reference is now made to the drawings which form a part hereof, and in which:-

Figure 1 is an end elevation, of my novel annealing cover.

Figure 2 is a side elevation, partly in section, of the same.

Figure 3 is a fragmentary detail view of the construction at the joint between the roof and 25 the side of the annealing cover.

Figure 4 is a section of the side wall taken on the line I-l of Figure 2.

Figure 5 is a section of said wall taken on the line 2-,2 of Figure 2. 30

Broadly my invention comprises providing an annealing cover formed of a relatively heavy material such as cast steel, and having a roof arch of relatively light material such as roll plate. The upper portions of the side walls are con- 35 nected together internally by means of tie rods of some heat resisting metal, which is capable of carrying relatively much higher loads per unit area than the metal of which the annealing cover itself is made. 40

Briefly in the practice of my invention, I provide an annealing cover of cast steel or similar material, of generally pylon form. The cover has side walls l0 provided with corrugations l0, and end walls It provided with corrugations H. These corrugations are for the purpose of additionally strengthening the side and end walls. I also prefer to make the walls of tapering construction, so that they are thicker near the .bottom than the top. Sections of a side wall taken near the top and bottom respectively, are clearly shown in Figures 4 and 5. It will be noted from these figures that I prefer to make the corrugations of constant depth, as indicated at A, while the thickness of the metal varies as indicated partly in section, 20

at B. All that has been said of the side walls I0 and their corrugations l0 applies equally to the end walls I I and their corrugations II. The end walls difier from the side walls, however, in that their top edges are arcuate to conform to the curvature of the top arch, and they may differ further in that they may be made of roll plate, and corrugated for greater strength, as shown in my copending application mentioned above, since they are not subjected to as great stresses as the side walls.

The top I2 is formed from relatively light weight roll plate, and is corrugated transversely for added strength and rigidity. This top l2 fits over the annealing cover between the upper curved portions of the end walls H, and the longitudinal edges of the top I! rest upon portions In" formed along the top edges of the side walls ill. The portions I0 present faces disposed at an angle equivalent to the angle formed by the radii of curvature of the top H2 at the edges thereof. This construction facilitates welding of the top and side wall members. The

top member i2 is, of course, welded to the portions it)" and to the upper curved portions of the end walls H.

For additional strength against lateral bulging of the side walls In, I provide along the top edges thereof a series of holes 13, which may be drilled or otherwise formed therein. The holes l3 on the opposite side walls are disposed in alignment, and tie rods [4 are inserted therein, stretching across the interior of the annealing cover. The rods I4 are then welded in position as indicated at 141;. This construction is clearly shown in Figure 3, where the manner of welding the top I2 to the portions I0" is also indicated at Her. The rods I4 are made from some heat resisting metal of considerable tensile strength.

The different configurations and shapes of the members shown in the drawings, and described in the specifications are not intended as limitations except insofar as they are specifically mentioned and claimed in the claims which follow.

Having now fully described my invention, what I claim as new and desire to secure by Letters Patent, is:-

1. A composite box annealing cover comprising a cast steel base member providing side and end walls, and a roof arch of relatively light material welded thereto.

2. A composite box annealing cover comprising a cast steel base member providing side and end walls, and a roof'arch member of relatively light roll plate welded thereto.

3. A composite box annealing cover comprising a cast steel base member providing side and end walls, and a roof arch member of relatively light weight corrugated roll plate welded thereto.

4. A composite box annealing cover comprising a unitary member providing side and end walls, said side and end walls being thicker at their bases than at their tops, and a roof arch member of relatively light weight roll plate welded thereto. 1

5. A composite box annealing cover comprising a cast steel base member providing side and end a relatively high tensile strength welded to the opposed side walls for the purpose described.

7. 1m an annealing cover according to claim 4,

a tie rod of heat resistant metal having a relatively high tensile strength welded to the opposed side walls for the purpose described.

8. In an annealing cover according to claim 5,

a tie rod of.heat resistant metal having a relatively high tensile strength welded to the opposed side walls for the purpose described.

9. A composite box annealing cover comprising a cast steel base member providing side and end walls, said walls being corrugated, and a roof arch of relatively lightmaterial welded thereto.

10. A composite box annealing cover comprising a unitary member providing side and end walls, said side and end walls being thicker at their bases than at their tops said walls being corrugated, and a roof arch member of relatively lightweight roll plate welded thereto.

11. A composite box annealing cover comprising a cast steel base member providing side and end walls, said side walls at their top edges being provided with upwardly and outwardly extending lips, and a roof arch member of relatively light weight corrugated roll plate welded to said lips, said lips being disposed at an angle equivalent to that of the radii of curvature of the roof arch at its lateral edges.

12. A composite box annealing cover comprising a cast steel base member providing side and end walls, said side walls at their top edges being provided with upwardly and outwardly extending lips, and a roof arch member of relatively light weight corrugated roll plate welded to said lips, said lips being disposed at an angle equivalent to that of the radii of curvature of the roof arch at its lateral edges, the top edges of said end walls being curved to the curvature of said roof arch and welded thereto.

13. A composite box annealing cover comprising a cast steel base member substantially of hollow pylon shape providing side and end walls, said walls being thicker at their bases than at their tops and provided with corrugations, the

radii of curvature of the roof arch at its lateral edges, said roof arch being welded to said lips and the top edges of said end walls. I

14. In an annealing cover according to claim 13, a tie rod of heat resisting metal having a relatively high tensile strength welded to the opposed side walls for the purpose described.

EDWARD N. MILLAN. 

